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MP: restore peer turn-step on the body channel -- arm turn state 4 from replicated turn (task #50)

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The body-channel swap (96a896a) fixed the stop-slide but regressed turn-in-place
to a rotating statue: the body Standing case only enters walk/reverse/stand, never
the turn clip (state 4).  On the master that arming comes from the LEG Standing
case cross-arming both channels (mech2.cpp:937) -- which the peer no longer runs.

FIX (peer branch): arm/exit the body turn state from the replicated turn
(replMppr->turnDemand, already derived from the replicated yaw rate with
hysteresis): standing + turning -> SetBodyAnimation(4) so the body case 4 advances
the trn clip (peer STEPS through the pivot); turn stops -> back to Standing.
Walk/reverse transitions still own their own exits.

Verified autonomous (forced spin): peer body channel holds state 4, trn clip
advances (frmAvg 0.2-0.3, frmMax 1-2), back-steps 0, no crash.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
arcattack
2026-07-15 07:38:33 -05:00
co-authored by Claude Opus 4.8
parent 96a896ae43
commit f094d78df1
1 changed files with 18 additions and 0 deletions
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game/reconstructed/mech4.cpp
+18
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@@ -2148,6 +2148,24 @@ void
// master's exact clips. Swapping the peer to the body channel RESTORES the
// original single-channel design (no new netcode). BT_PEER_LEGCH=1 = old.
static const int s_peerLegCh = getenv("BT_PEER_LEGCH") ? 1 : 0;
// TURN-STEP ARMING for the body channel: the body Standing case only enters
// walk/reverse/stand -- it never arms the turn-in-place clip (state 4); on the
// master that arming comes from the LEG Standing case cross-arming both
// channels (mech2.cpp:937 note), which the peer no longer runs. Arm/exit the
// body turn state here from the replicated turn (replMppr->turnDemand, from the
// replicated yaw rate + hysteresis above): standing + turning -> state 4 (body
// case 4 then advances the trn clip -> the peer STEPS through the pivot); turn
// stops -> back to Standing. Walk/reverse transitions still own their exits.
if (!s_peerLegCh)
{
const int bs = (int)bodyStateAlarm.GetLevel();
const bool turning = (replMppr->turnDemand > 0.05f
|| replMppr->turnDemand < -0.05f);
if (turning && bs == 0) // standing + turning -> enter turn
SetBodyAnimation(4);
else if (!turning && bs == 4) // turn stopped -> back to stand
SetBodyAnimation(0);
}
const Scalar replLegAdv = s_peerLegCh
? AdvanceLegAnimation(dt) // old: re-derived leg SM
: AdvanceBodyAnimation(dt, 1); // authentic: body channel, mj=1 poses skeleton